We look at the division of 63557621 by 455 
The aim is to understand the frequency of 455 in 63557621.

Step 1:
If we divide 6 by 455, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 455

On to step 2:
When dividing 63 by 455, we get 0 with a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Bring next digit (5) of the dividend behind the 63 and repeat the process: 635 / 455

On to step 3:
635 divided by 455 is 1 with a remainder of 180.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 455 from 635 and we're left with 180.
Fetch the next digit (5) from the dividend, attach it to 180 and continue: 1805 / 455

Step 4:
If we divide 1805 by 455, we get 3 and a remainder of 440.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Deduct 1365 from 1805 and we're left with 440.
Grab the next digit (7) from the dividend, add it to 440, then carry on: 4407 / 455

Advancing to step 5:
455 can be fit into 4407 9 times, resulting in a remainder of 312.
The next digit of our result is 9. 
Result so far: 139.0
If we subtract 4095 from 4407, we get 312.
Fetch the next digit (6) from the dividend, attach it to 312 and continue: 3126 / 455

Moving on to step 6:
455 can be fit into 3126 6 times, resulting in a remainder of 396.
Record the quotient 6 as the next digit in the result. 
Result so far: 1396.0
The remainder is 396 after subtracting 2730 from 3126.
Bring next digit (2) of the dividend behind the 396 and repeat the process: 3962 / 455

Step 7:
When dividing 3962 by 455, we get 8 with a remainder of 322.
Record the quotient 8 as the next digit in the result. 
Result so far: 13968.0
Subtract 3640 from 3962 to get 322.
Include the next digit (1) from the dividend after 322, then repeat: 3221 / 455

Moving on to step 8:
455 can be fit into 3221 7 times, resulting in a remainder of 36.
Record the quotient 7 as the next digit in the result. 
Result so far: 139687.0
If we take 3185 away from 3221, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 9:
455 goes into 360 0 times with a remainder of 360.
The next digit of our result is 0. 
Result so far: 139687.0
Subtract 0 from 360 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Advancing to step 10:
If we divide 3600 by 455, we get 7 and a remainder of 415.
Record the quotient 7 as the next digit in the result. 
Result so far: 139687.07
If we take 3185 away from 3600, we end up with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Let's proceed to step 11:
When dividing 4150 by 455, we get 9 with a remainder of 55.
The number 9 becomes the next digit in our result. 
Result so far: 139687.079
Subtracting 4095 from 4150 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 12:
550 divided by 455 is 1 with a remainder of 95.
The next digit of our result is 1. 
Result so far: 139687.0791
Deduct 455 from 550 and we're left with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Going ahead to step 13:
950 divided by 455 is 2 with a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 139687.07912
Subtract 910 from 950 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 14:
455 goes into 400 0 times with a remainder of 400.
Put 0 as the next digit of the answer. 
Result so far: 139687.07912
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 15:
If we divide 4000 by 455, we get 8 and a remainder of 360.
Use 8 as the next digit of our solution. 
Result so far: 139687.0791208
The remainder is 360 after subtracting 3640 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 16:
If we divide 3600 by 455, we get 7 and a remainder of 415.
The number 7 becomes the next digit in our result. 
Result so far: 139687.07912087
Deduct 3185 from 3600 and we're left with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Our division results in 139687.07912087 with a remaining 4.15e-07.